When talking about left/right side are you referring to the inside or the outside of the refridgerator?
Answer Hi! For model number (FRT21P5AW6) we show three racks on the inside of the fresh food door. For the upper and lower right rack support you will want to order part # 240311502. For the left side support of the upper and lower rack you will use part # 240311501. For the center right support you will order part # 240331502 and for the left side order part # 240331501. Thanks!